JP2002276499A - V-type diesel engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a water injection device into each cylinder, in a V-type diesel engine having a plurality of cylinder pairs arranged in a V-type. SOLUTION: Water is simultaneously poured in the respective fuel feed passages of fuel injection valves 1 and 2 to cylinder pairs arranged in a V-type from a water pouring piston 8 through a flow dividing valve 12 during the exhaust processes and the intake processes of the two pistons. Water poured in the fuel feed passages of the two fuel injection valves 1 and 2 is injected simultaneously with injection of fuel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to nitrogen oxides (NO
_{The present invention} relates to a V-type diesel engine in which water is injected into a combustion chamber to reduce _x ) and to reduce black smoke and fuel consumption.

[0002]

2. Description of the Related Art In order to reduce nitrogen oxides (NO _x ) in exhaust gas of a diesel engine, and at the same time to reduce exhaust black smoke and improve fuel consumption rate, water is mixed in the fuel. It is known to use an emulsion fuel. Further, for the same purpose, a water-added diesel engine in which water is independently injected into a combustion chamber separately from fuel is also known.

Further, a predetermined amount of water is supplied to a fuel passage of the fuel injection valve upstream of a junction of the injected water so that fuel and water are injected from the same fuel injection valve into the combustion chamber. Diesel engines have been proposed in which, when opened, fuel is injected first from the junction in the fuel passage, then the predetermined amount of water is supplied, and finally the remaining fuel in the fuel passage is fully injected. (Patent No. 277)
No. 2114).

Further, in this patented water-added diesel engine, water and fuel are alternately multi-layered in the fuel passage of the fuel injection valve so that the amount of water injection can be increased without causing insufficient combustion. Water is injected into the fuel passage of the fuel injection valve such that a liquid column is formed, and the liquid column in which water and fuel are alternately multilayered is extruded while maintaining the multilayer structure, and water is injected. There is also provided a stratified injection diesel engine in which fuel and fuel are alternately injected and only fuel is injected last (Japanese Patent No. 2102770).

In a diesel engine in which water is added to the combustion chamber as described above, conventionally, water is supplied to each cylinder, and water is injected separately from the fuel injection system for water injection. An injection device is required for each cylinder, and in particular, a high-pressure water injection device has a complicated structure.

Particularly, in a V-type diesel engine having a plurality of cylinder pairs arranged in a V-shape on the left and right sides, water is injected into the fuel injection valves for the cylinders in the right and left rows individually at an appropriate timing. Therefore, the control system of the pump was complicated. As an example, FIG. 4 shows a general ignition sequence in an 18-cylinder V-type diesel engine arranged with 9 cylinders on each side. In each of the cylinders in the left and right rows, ignition is performed in an order shifted by a bank angle of 50 ° as shown in FIG.

FIG. 5 shows the timing of fuel injection when water injection is performed for each cylinder in the V-type diesel engine and the timing of water injection into the fuel injection valve for water injection. As shown in FIG. 5, water is injected into the fuel injectors for the cylinders in the left and right rows by shifting the bank angle between the exhaust process and the air supply process. As described above, since water is injected into the fuel injection valves of the respective cylinders individually at appropriate timings, a problem arises in that the control system of the pump for performing the injection is complicated and the cost is increased.

[0008]

[0008] The present invention is a V-type diesel engine of a plurality chromatic cylinder pairs arranged in a V-type, as object to simplify the water injection device for of the NO _x reduction for each cylinder I have.

[0009]

In order to solve the above-mentioned problems, the present invention provides a water injection device for each pair of cylinders arranged in a V-shape. Provided is a V-type diesel engine in which water injection is simultaneously performed. In a V-type diesel engine,
Generally, each cylinder pair forming both cylinder rows in the left and right rows (L row, R row) is arranged in a crank arrangement in which the cylinders are ignited continuously, and the ignition timing difference between both rows is only the bank angle. ing.

In the present invention, by taking advantage of this feature, water injection for water injection into each pair of cylinders is performed simultaneously. By adopting this configuration of the present invention, only one water injection device is required for each pair of cylinders in the V-type diesel engine. Can be
The configuration of the water injection device is extremely simplified.

In the V-type diesel engine according to the present invention,
Each pair of cylinders in the left and right rows may be configured to simultaneously inject water into the fuel passage of the fuel injection valve of each cylinder during the exhaust and air supply processes in both cylinders. Further, in this case, it is preferable that water is injected into the fuel passage alternately with the fuel so as to form a multilayer structure, regardless of the injected water, so that combustion is stable.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a V-type diesel engine according to the present invention will be described in detail with reference to the accompanying drawings.

(First Embodiment) First, a V-type diesel engine according to a first embodiment of the present invention shown in FIG. 1 will be described. In FIG. 1, reference numeral 1 denotes a fuel injection valve for a right-row (R row) cylinder, and 2 denotes a fuel injection valve for a left-row (L row) cylinder. The cylinders in the left and right rows constitute one of a pair of cylinders arranged in a V-shape. Reference numerals 3 and 4 denote needle valves of the fuel injection valves 1 and 2, respectively.

A fuel supply pump 5 is driven by a cam mechanism 6 to supply C or A heavy oil to the fuel injection valve 2 through a fuel supply pipe 7. Although not shown, the fuel injection valve 1 in the right column is similarly operated by the fuel supply pump.
Alternatively, it is configured such that heavy fuel oil A is supplied as fuel. Reference numeral 8 denotes a water injection piston with stroke adjustment, which injects water supplied by the water supply pump 10 into each fuel supply path of the fuel injection valves 1 and 2.

Reference numeral 11 denotes a hydraulic oil pump.
Is supplied to the water injection piston 8 through the control valve 9 to operate the water injection piston 8. 12 is a diversion valve,
It functions to distribute the water supplied from the water injection piston 8 to the fuel supply passages of the left and right fuel injection valves 1 and 2.

In the V-type diesel engine provided with the fuel injection device of FIG. 1 having the above-described structure, the water supplied by the water injection piston 8 passes through the flow dividing valve 12 to each fuel supply passage in the fuel injection valves 1 and 2. To the fuel-water-fuel in the state of being overlapped with the fuel-water-fuel by the injection method of the above-mentioned Patent No. 2772114, or by the injection method of the above-mentioned Patent No. 2102770, Water and fuel are alternately filled in the fuel supply path so as to form a multi-layered liquid column.

FIG. 2 shows the timing of fuel injection by the fuel injection valves 1 and 2 and the timing of water injection into the fuel injection valves 1 and 2 in this case. As can be seen in FIG. 2, the injection of fuel to the fuel injectors 1, 2 for the left and right rows of cylinders takes place simultaneously during the exhaust and supply process in both the left and right rows of cylinders. The water simultaneously supplied to the fuel injection valves 1 and 2 as described above is injected into each cylinder together with the fuel at the time of fuel injection. In this way, by simultaneously injecting water into both cylinders in the left and right rows of the V-type diesel engine,
The number of water injection devices may be half of the conventional one, and the configuration of the water injection device is extremely simplified.

(Second Embodiment) Next, a V-type diesel engine according to a second embodiment of the present invention shown in FIG. 3 will be described. In FIG. 3, reference numeral 13 denotes a water injection piston with a stroke adjustment. Water sent out by the water injection piston 13, which is mechanically driven by a cam mechanism 14, passes through a check valve 15 and is divided by a flow dividing valve 12 into a left and right fuel injection valve 1.
Water is injected into 2.

The V-type diesel engine according to the second embodiment is configured such that water is injected into the fuel injection valves 1 and 2 by a water injection piston 13 which is driven mechanically. The configuration is substantially the same as that of the V-type diesel engine according to the embodiment. In FIG. 3, the same portions as those in FIG. 1 are denoted by the same reference numerals, and redundant description thereof will be omitted.

As described above, the present invention has been specifically described based on the illustrated embodiments. However, the present invention is not limited to these embodiments, and specific structures within the scope of the present invention shown in the claims are set forth. Needless to say, various changes may be made to the configuration.

For example, in the above embodiment, the fuel is injected into the fuel passage of the fuel injection valve in a layered or multilayered manner, and the fuel and water are alternately injected into the cylinder from the injection valve together with the fuel. Although the fuel cell and the water have been described, the fuel and the water may be injected into the cylinder from the injection valve without forming a layered or multilayered structure.

[0022]

As described above, according to the present invention, one water injection device is provided for each cylinder pair arranged in a V-shape, and water is injected from the water injection device to each cylinder pair. And a V-type diesel engine that performs the same at the same time. In a V-type diesel engine, each pair of cylinders constituting both right and left cylinder rows is generally arranged in a crank arrangement in which the cylinders are continuously ignited, and the ignition timing difference between the two rows is only the bank angle. Therefore, in the present invention, water injection for water injection into each pair of cylinders is performed simultaneously.

By employing this configuration of the present invention, only one water injection device is required for each pair of cylinders in a V-type diesel engine, and thus, the water injection device for a V-type diesel engine can be reduced to a conventional one. / 2, and the configuration of the water injection device is extremely simplified.

[Brief description of the drawings]

FIG. 1 is an explanatory drawing showing a fuel injection system in a V-type diesel engine according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing fuel injection and water injection timing in both left and right cylinders in the V-type diesel engine according to the first embodiment.

FIG. 3 is an explanatory diagram showing a fuel injection system in a V-type diesel engine according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram showing an ignition sequence in both left and right cylinders in a conventional V-type diesel engine.

FIG. 5 is an explanatory diagram showing fuel injection and water injection timing for both left and right cylinders in a conventional V-type diesel engine.

[Explanation of symbols]

 Reference Signs List 1 fuel injection valve for R row cylinder 2 fuel injection valve for L row cylinder 3 needle valve 4 needle valve 5 fuel supply pump 6 cam mechanism 7 fuel supply pipe 8 water injection piston 9 control valve 10 water supply pump 11 hydraulic oil pump 12 branch flow Valve 13 Water injection piston 14 Cam mechanism 15 Check valve

Continued on the front page F term (reference) 3G066 AA07 AA09 AB02 AB08 AD12 BA17 BA24 BA25 BA61 3G092 AA02 AA06 AA15 AB03 AB04 AB17 BB06 BB20 DE03S DE05S DF06 DF10 DG01 DG05 FA17 FA18 FA24 FA50 HC08Z HE03Z

Claims (3)

[Claims] In a V-type diesel engine having a plurality of cylinder pairs arranged in a V-shape, a water injection device is provided for each cylinder of each pair, and water is injected from the water injection device to each pair of cylinders. V-type diesel engine, characterized in that water injection for water is simultaneously performed. 2. The V-type diesel engine according to claim 1, wherein the water is injected into a fuel passage of a fuel injection valve of each cylinder during an exhaust and air supply process in the cylinder pair. 3. The V-type diesel engine according to claim 1, wherein water is injected into the fuel passage alternately with fuel in a multilayered manner.